<?php
/**
 * Smarty Internal Plugin Compile Assign
 *
 * Compiles the {assign} tag
 *
 * @package Smarty
 * @subpackage Compiler
 * @author Uwe Tews
 */

/**
 * Smarty Internal Plugin Compile Assign Class
 *
 * @package Smarty
 * @subpackage Compiler
 */
class Smarty_Internal_Compile_Assign extends Smarty_Internal_CompileBase {

	/**
	 * Compiles code for the {assign} tag
	 *
	 * @param array  $args      array with attributes from parser
	 * @param object $compiler  compiler object
	 * @param array  $parameter array with compilation parameter
	 * @return string compiled code
	 */
	public function compile($args, $compiler, $parameter)
	{
		// the following must be assigned at runtime because it will be overwritten in Smarty_Internal_Compile_Append
		$this->required_attributes = array('var', 'value');
		$this->shorttag_order = array('var', 'value');
		$this->optional_attributes = array('scope');
		$_nocache = 'null';
		$_scope = Smarty::SCOPE_LOCAL;
		// check and get attributes
		$_attr = $this->getAttributes($compiler, $args);
		// nocache ?
		if ($compiler->tag_nocache || $compiler->nocache) {
			$_nocache = 'true';
			// create nocache var to make it know for further compiling
			$compiler->template->tpl_vars[trim($_attr['var'], "'")] = new Smarty_variable(null, true);
		}
		// scope setup
		if (isset($_attr['scope'])) {
			$_attr['scope'] = trim($_attr['scope'], "'\"");
			if ($_attr['scope'] == 'parent') {
				$_scope = Smarty::SCOPE_PARENT;
			} elseif ($_attr['scope'] == 'root') {
				$_scope = Smarty::SCOPE_ROOT;
			} elseif ($_attr['scope'] == 'global') {
				$_scope = Smarty::SCOPE_GLOBAL;
			} else {
				$compiler->trigger_template_error('illegal value for "scope" attribute', $compiler->lex->taglineno);
			}
		}
		// compiled output
		if (isset($parameter['smarty_internal_index'])) {
			$output = "<?php \$_smarty_tpl->createLocalArrayVariable($_attr[var], $_nocache, $_scope);\n\$_smarty_tpl->tpl_vars[$_attr[var]]->value$parameter[smarty_internal_index] = $_attr[value];";
		} else {
			$output = "<?php \$_smarty_tpl->tpl_vars[$_attr[var]] = new Smarty_variable($_attr[value], $_nocache, $_scope);";
		}
		if ($_scope == Smarty::SCOPE_PARENT) {
			$output .= "\nif (\$_smarty_tpl->parent != null) \$_smarty_tpl->parent->tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]];";
		} elseif ($_scope == Smarty::SCOPE_ROOT || $_scope == Smarty::SCOPE_GLOBAL) {
			$output .= "\n\$_ptr = \$_smarty_tpl->parent; while (\$_ptr != null) {\$_ptr->tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]]; \$_ptr = \$_ptr->parent; }";
		}
		if ( $_scope == Smarty::SCOPE_GLOBAL) {
			$output .= "\nSmarty::\$global_tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]];";
		}
		$output .= '?>';
		return $output;
	}

}

?>